How does yarn resolve whether it has a cached dependency or not?

[simPod]

I have generated yarn cache using yarn install

Then I have copied all files from .yarn/cache to another directory with the same project into it's .yarn/cache.

But yarn says it does not have dependencies cached so I see these:

➤ YN0013: │ @adobe/css-tools@npm:4.0.1 can't be found in the cache and will be fetched from the remote registry
...
➤ YN0019: │ @adobe-css-tools-npm-4.0.1-414e22a25e-8.zip appears to be unused - removing

even though I have '.yarn/cache/@adobe-css-tools-npm-4.0.1-414e22a25e-8.zippresent, no and the cache dir is set to.yarn/cache` and global cache is disabled.

I'd expect Yarn to use those files I copied into a cache.